The Effect of Gases on Pyroelectric Properties of PVDF/TiO₂ Treated by Plasma Etcher

Abstract

Composite thin films containing PVDF and TiO 2 have been prepared by using spin coating technique. The highest pyroelectric activity as measured by quasi static method is shown by the composite thin films containing 20 wt% of TiO 2 . The doping of TiO 2 in PVDF thin films has reduced the optimum poling electric field needed to be applied in order to observe pyroelectric activity in the composite thin films. Plasma treated composite thin films with Argon (Ar) gas has further increased the pyroelectric coefficient from 33 µCm -2 K -1 to 83 µCm -2 K -1 . The investigation on the surface morphology and the phases of the composite thin film indicate that the change in the lamella structure and also the existence of the β-phase have contributed to the increase in the pyroelectric activity of the PVDF/TiO 2 composite thin film.

Enhancing pyroelectric and ferroelectric properties of PVDF composite thin films by dispersing a non-ferroelectric inclusion La2O3 for application in sensors

“…The pyroelectric coefficients of the series of poled composite thin films were determined by a quasi-static method. Details of the experimental setup are reported in our previous work [11]. The triangular heating and cooling cycle was set with ramping rates of 0.01-0.05°C/s (controlled by LakeShore 330 temperature controller) for an amplitude DT = 1°C at 25°C.…”

Effect of TiO2on enhanced pyroelectric activity of PVDF composite

“…Thus, a homogeneous and thin film that is free from pin-holes can be spin-casted onto aluminized glass substrates. Previous work [26] has shown that the optimum dispersed concentration of TiO 2 in PVDF composites is in the range of 10-30 wt%. The pyroelectric activity of the composite thin films dispersed with the optimum amounts of TiO 2 has exhibited the highest pyroelectric activity.…”